Posted By
MMS
on 2017-03-19
06:55:50
 |  Re: Revival of interesting 'n' funny stuffs
Well Istvan did it again 
He (with the other guy mentioned too in the link below) programmed a SID emulator on the ZX Spectrum 128 machine playing the native SID musics via AY chip.
(UPDATE: gerlitzer: it is the same engine you mentioned working on Enterprise, but the DAVE chip has 4 independent PCM while AY had no such built-in feature )
https://www.youtube.com/watch?v=Zr1r6FSrsz4
Very faithful sound with no extra HW involved, with only a slight sampling noise.
I suppose it works in the same way as the DigiSID player on Plus/4, and probably the ZX Spectrum had a little more processor power to execute the program than Plus/4 (when srceen is on).
Actually I do not know, how he made it on AY, as it has no real PCM, and the volume control also only 16 resolution, and it should sound worse than a 4bit DAC. But it sounds like a 6 or 7 bit DAC.
Or he may wrote a Viterbi routine to combine the three AY channel into one proper sound frequency?
Anyhow, nice work.
|
